TW201643506A - Head mounted display apparatus - Google Patents

Abstract

A head mounted display (HMD) apparatus and a display method thereof are provided. The apparatus includes a display configured to provide an image, an active element comprising a plurality of micro-mirrors and configured to reflect the image provided on the display, and a processor configured to detect a user's eyesight and adjust a focal length of the image provided on the display by controlling a gradient of at least some of the plurality of the micro-mirrors based on the detected user's eyesight.

Description

Head mounted display device

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a head mounted display device, and more particularly to a display device for measuring a user's vision by using an active element and correcting the focus by adjusting the focus.

In head mounted displays (HMDs), optical displays are used to collimate, amplify, and relay an image source. "Aligning" an image refers to generating a virtual image and accurately aligning the virtual image a few miles away from the user's face. "Zooming in" an image refers to rendering an image larger than the actual size of the image. A "relay" image source refers to a virtual reality image that produces a face away from the user and an image source.

Recently, head-mounted displays require more sophisticated and sophisticated technology because head-mounted displays are used to display virtual reality (VR) and augmented reality (AR). Since the head-mounted display is a display device that is used closest to the eyes of the user, there is a need for a technique that can alleviate eye fatigue.

One of the prior art methods for measuring and correcting the user's vision involves controlling the optical path length to correct vision by adjusting the position of the lens that constitutes the optics within the head mounted display. In addition, there is also a vision correction method that involves adjusting the position of a display that constitutes an optical device within a head mounted display to control the optical path length.

However, the prior art technique has disadvantages in that accurate visual force measurement, correction of vision of the left and right eyes, and correction of astigmatism, respectively, cannot be performed. In addition, when multiple users share the same head mounted display, whenever the user changes, the user may feel the inconvenience of needing to readjust the visual strength measurement.

The above information is presented as background information only to assist in understanding the invention. It is not possible to make a determination as to whether or not any of the above is applicable to the prior art regarding the present invention and the statement.

The various aspects of the present invention address at least the above mentioned problems and/or disadvantages and provide at least the advantages described below. Accordingly, an aspect of the present invention provides a display device and a control method thereof, which reduce the size of a head mounted display (HMD) device by using an active element of variable focal length, and based on the left The information stored in the eye and right eye measures information stored in the eye and the information associated with the user information to automatically correct the user's vision, thereby reducing eye fatigue of the user of the head mounted display.

Another aspect of the present invention provides a high definition display screen for a user by using such an active component.

In one aspect of the invention, a head mounted display device is provided. The device includes a display for providing an image, an active component including a plurality of micromirrors for reflecting an image provided on the display, and detecting a user's vision based on the detected user a processor that controls a gradient of at least a portion of the plurality of micromirrors to adjust the focal length of the image provided on the display

The processor may generate a reticle pattern on the active component such that only a specific area of a light ray emitted from the display for visual force measurement is formed as an image on a retina of the user. And detecting the vision by varying an optical power of the active component.

The processor may adjust the optical power of the active component to correct the visual acuity of the user based on the detected visual acuity of the user.

The processor may change a focus of the virtual reality image displayed on the display at a specified time, or estimate an object position and change of the virtual reality image displayed on the display by using image recognition a focus of the image to change a focal length of the virtual reality image.

The processor may adjust a focus of each layer of the virtual reality image by causing the power of the active component to vary proportionally to the object distance of the virtual reality image, and when the user is nearsighted (myopic or Nearsighted), a range of vision adjustments of the user is extended by assigning an offset in the power of a lens to vary the power of the active element.

The processor uses high speed tilt to drive the active components to expand the resolution of the display.

The active component can be disposed in a vertical direction relative to the display and a light path.

The head mounted display device may further include a memory for storing the detected visual information and a biometric information of the user.

The head mounted display device may additionally include a plurality of polarizers. The head mounted display device can obtain a virtual reality image by using: a first polarizer disposed between the active component and the lens; and a second polarizer disposed on a lens a mirror surface and a front surface of a second polarizing beam splitter; and a third polarizer disposed perpendicular to the second polarizer, parallel to the active component, and disposed on the second polarized light On one side of the beam splitter.

The first polarizer and the second polarizer may each be a quarter-wave plate, and the third polarizer may be a half-wave plate.

The head mounted display device may additionally include a collimating lens for generating the light ray emitted from the display to become a parallel ray; an active component for converging or diverging from the a light ray emitted by the lens; a first diffractive element for diffracting the light ray emitted from the active element; a quarter wave plate disposed on the first diffractive element And the active element for changing a polarization state; a light guide for guiding the diffracted light ray using total reflection; and a second diffraction element for using the diffraction The light rays are emitted to a user.

The first diffractive element can transmit a first linearly polarized light ray emitted from the display and a second linearly polarized light ray perpendicular to the first linearly polarized light ray.

The head mounted display device can adjust a focus of an augmented reality image by: arranging the first diffractive element parallel to the active element; setting the second diffractive element Parallel to the eye of the user; and positioning an optical axis of the active component at a specified angle relative to an optical axis of the user's eye.

In an embodiment of the invention, a display method of a head mounted display device is provided. The method includes the steps of: detecting a user's vision information by using an active component including a plurality of micromirrors; storing the detected visual information of the user to a user's information; When the user is identified based on the information of the user, controlling a gradient of at least a portion of the plurality of micromirrors based on the detected visual information of the user to adjust to be provided to a display a focal length of an image.

The detecting may include the steps of: generating a reticle pattern for forming only a specific region of the light ray emitted from the display on a center of the active component for the visual force And the specific area may be formed as an image on the retina of the user; and the optical power is measured by varying the optical power of the active element.

The display method can additionally include adjusting the optical power of the user based on the vision detected from the active component to correct the visual acuity of the user.

The adjustment of the focal length may further comprise one of the following steps: changing a focus of a virtual reality image displayed on the display at a specified time; and estimating the display on the display by using image recognition An object position in the virtual reality image and a change in focus of the image to change a focal length of the virtual reality image.

The display method can additionally include adjusting a focus of each layer of a virtual reality image by causing the power of the active component to vary proportionally with an object distance within the virtual reality image.

The display method may additionally include expanding a vision adjustment of the user by assigning an offset in the power of a lens to cause the power of the active component to change when the user is nearsighted range.

The display method can additionally include using a high speed tilt to drive the active component to expand a resolution of the display.

Based on the above, the head mounted display device of various embodiments of the present invention can measure the visual acuity of the user by using the active component to provide an optimized image of the user. In addition, the head mounted display device can be miniaturized by using the active component and can provide a high definition display screen for the user.

The above described features and advantages of the invention will be apparent from the following description.

The following description of the various embodiments of the invention are intended to The description below includes various specific details to assist the understanding, but such details should be considered as illustrative only. Accordingly, it is understood by those of ordinary skill in the art that the various embodiments of the invention described herein may be modified and modified without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not to be construed as limited Therefore, it should be apparent to those skilled in the art that the following description of the various embodiments of the present invention are intended to be illustrative only and not to limit the scope of the appended claims The invention as defined.

It should be understood that the singular forms """ Thus, for example, reference to "a component surface" shall include one or more of these surfaces.

In addition, the suffix "-er(-r)" of the component names used herein is merely a description for easy writing, and therefore, these do not give any meaning or role to distinguish from each other.

In addition, expressions including ordinal numbers (such as "first", "second", etc.), as used herein, may be used to describe various elements, but the elements are not limited by such expression. The above expressions are only used to distinguish one element from another. For example, the "first component" may be named "second component" or, similarly, the "second component" may be named "first component" without departing from the scope of the disclosure.

Certain embodiments of the present invention will now be described in detail with reference to the drawings.

In the following description, the same drawing numbers are used for the same elements in different drawings. The matters defined in the following description, such as detailed construction and elements, are intended to be a comprehensive understanding of the invention. Thus, it will be apparent that various embodiments of the invention may be practiced without the items defined below.

The invention will be described in detail below with reference to the accompanying drawings.

1 is a schematic diagram of a general configuration of a head mounted display (HMD) according to an embodiment of the invention.

Referring to FIG. 1, the head mounted display 100 can be a display device in the form of a binocular. However, the present invention is not limited thereto, and thus, the head mounted display 100 may be mounted on the head or may include a thin and light structure like general glasses.

In an embodiment of the invention, the head mounted display 100 can include a display that displays an image for the left and right eyes, an optical slice (not shown) that can measure the user's vision, and a controller 101. . The controller 101 can be disposed external to the head mounted display 100 or inside the head mounted display 100. A processor 220 of FIG. 2A can perform the functions of the controller 101. The optical section will be specifically explained in Figure 2B.

The controller 101 can adjust the optical power based on the measured vision of the user in the optical slice to thereby correct the user's vision. In addition, the controller 101 can store the measured visual power of the user in a memory (not shown) and control the optical slice to measure the vision based on the stored user information.

When the controller 101 is disposed outside the head mounted display 100, the head mounted display 100 can perform communication with the controller 101, and the controller 101 can perform the communication to make the head mounted display 100 available from an image processing device. (not shown) receives an image. The head mounted display 100 and the controller 101 can perform this communication by wire or wirelessly.

Moreover, an embodiment of the present invention is applicable to all display devices having optical devices that can measure and correct the user's vision in the display device and the head mounted display 100.

2A is a block diagram of a configuration of a head mounted display in accordance with an embodiment of the present invention.

Referring to FIG. 2A, the head mounted display 100 can include a display 210, a processor 220, a memory 230, and an active component 240.

The display 210 can provide a plurality of images and is stored in the memory 230 based on a left eye vision and a right eye vision of the user measured by the active component 240 and a control command according to the processor 220. Information to display a corrected image that is appropriate for the user's vision.

In addition, the display 210 can be implemented in various forms, such as a liquid crystal display (LCD), an organic light emitting diode (OLED), a flexible display, a three-dimensional (3D) display, etc. . The display 210 can be configured to function as a touch screen and as an input device for receiving an input of a user's touch command.

The memory 230 can store the visual information of the user and the biometric information generated by the processor 220. In addition, the memory 230 can store corrected vision information of a user. The memory 230 can store programs, calculation parameters, and user instructions for use in the processor 220. For example, the memory 220 can include at least one of a hard disk, a multimedia card, a flash memory, a secure digital (SD) card, or an extreme digital (XD) card. In addition, the memory 230 can be a random access memory (RAM) or a read only memory (ROM) in the processor 220.

The active component 240 can modify the focus by adjusting the optical power of a user, and includes a deformable mirror whose gradient can be varied. The active component 240 can include a plurality of micromirrors and reflect the image provided by the display 210. Embodiments of the invention are explained below in which micro-electromechanical systems (MEMS) mirrors including micromirrors are used as the active elements 240. Please refer to FIG. 6A and FIG. 6B to specifically describe the active component 240.

The processor 220 can control the active component 240 to detect the visual force of the user, and control the gradient of at least a portion of the plurality of micromirrors in the active component 240 based on the detected visual force of the user, thereby adjusting the self The focal length of the image provided by display 210.

The processor 220 can control the display 210 to generate a visual force metering ray and control the active component 240 such that the apparent power metering ray can be formed on the user's retina through at least one of the plurality of micromirrors in the active component 240. Image. In addition, the processor 220 can record the user's vision information in the memory 230 based on the information detected by the active device 240 at the time when the image is formed on the user's retina.

The processor 220 can generate a reticle pattern on the active component 240 to form a partial region of the light ray for measuring visual acuity emitted from the display 210 as an image on the user's retina, and by changing the active component 240 optical power to detect vision. Additionally, the processor 220 can adjust the optical power of the active component 240 based on the detected vision to thereby correct the user's vision.

Additionally, processor 220 can modify a focus of the virtual reality image displayed on display 210 at a specified time. In addition, the processor 220 can estimate the object position of the virtual reality image displayed on the display 210 by using image recognition and modify a focal length of the virtual reality image by changing the focus of the image.

Moreover, the processor 220 can vary the power of the active component to be proportional to the object distance of the virtual reality image to thereby adjust the focus of a layer of the virtual reality image. Moreover, when the user of the head mounted display 100 is nearsighted, the processor 220 can specify an offset in power of a lens and expand the range of vision adjustment of the user as the power of the active component 240 changes.

The processor 220 can be used to measure the user's vision by receiving user commands and varying the gradient of the micromirrors of the active components. For example, the processor 220 can modify the gradient of the micro-mirror of the active component by the user through a user interface (UI) or a menu button for visual force measurement. For example, the processor 220 can receive an instruction for adjusting vision and an instruction for measuring vision from a user through a touch input or a drag input input to a touch screen of the head mounted display 100. Moreover, the processor 220 can receive an instruction to adjust the vision and an instruction to measure the vision from the user through a user manipulation command (eg, a roller button provided in the head mounted display 100).

The head mounted display 100 can include a communication device (not shown). The communication device can perform wired/wireless data communication with an external electronic device. When performing data communication with an external electronic device according to the wireless communication method, the communication device may include at least one of the following: a Wi-Fi direct communication module, a Bluetooth (BT) module, and infrared data. Association (infrared data association, IrDA) module, NFC (near field communication, NFC) module, ZigBee (ZigBee) modules, cellular communication module, a third-generation (3 ^rd generation, 3G) mobile communications module, the 4th generation (4 ^th generation, 4G) mobile communication module and long Term Evolution (long term evolution, LTE) communication modules.

In this embodiment, when performing data communication with an external electronic device according to a wired communication method, the communication device may include an interface module, such as a universal serial bus (USB). Through the interface module, the communication device can transmit or receive image data or transmit or receive firmware data to perform firmware upgrade when physically connected to an external terminal (eg, a personal computer).

Through the above procedure, the head mounted display 100 in an embodiment of the present invention can measure the user's vision by using the active component 240 to provide an image optimized by the user.

2B is a block diagram of a configuration of an optical slice in a head mounted display in accordance with an embodiment of the present invention.

Referring to FIG. 2B, the optical slice 260 can include an active component 240, a display screen 270, a beam splitter 275, a lens 280, a lens mirror 285, and a plurality of polarizers 290 (quarter wave or half wave) Tablet) and a 295. The unit constituting the optical slice 260 is not limited to the above, and may further include other new units. The features of each unit will be specifically explained by referring to FIG.

The display screen 270 can generate light rays on the left and right eyes of the head mounted display 100. Display screen 270 can be flat or curved. Display screen 270 can include an indicator optics. Each of the left and right eyes of the head mounted display 100 can include a display screen 270, or each of the left and right eyes of the head mounted display 100 can include two display screens 270. An embodiment of the present invention will be explained below in which each of the left eye and the right eye of the head mounted display 100 includes a display screen 270.

Beam splitter 275 can include a first beam splitter that can reflect light rays emitted from display screen 270 and a second beam splitter that can reflect light rays emitted from active element 240. The lens 280 (eg, a concave lens, a convex lens, a cylindrical lens) can converge the light rays reflected from the beam splitter 275. The active element 240 can reflect the light rays emitted from the lens 280 by converging or diverging. The lens mirror 285 can converge the light rays reflected from the beam splitter 275 and emit the light rays to a user.

The polarizer 290 may include a plurality of polarizers (quarter wave plates, half wave plates).稜鏡295 expands the user's field of view. The crucible 295 can be a freely curved crucible that can expand the light rays that converge from the display screen 270 and induce it to the user's eyes.

3 is a schematic diagram of a conventional head mounted display that corrects the user's vision.

Referring to FIG. 3, in the prior art, the user's vision can be corrected by setting the lens mirror 301 and the display screen 300 constituting the optical device of the head mounted display 100 on a uniform light path, and adjusting the lens. The distance between the mirror 301 and the display screen 300 (i.e., the length of the light path) is used to focus the image in the user's eye 302.

In addition, in the prior art, the user's vision can be corrected by the following operations: a display screen 300, a lens mirror 301, and a mirror surface (not shown) configured as optics of the head mounted display 100. Positioning on a uniform light path and adjusting at least one of a first light path from the display screen 300 to the mirror surface (not shown) and a second optical path from the mirror surface (not shown) to the lens mirror 301 One of them.

However, the above technique may have a problem that when the user of the head mounted display 100 changes, the user's vision cannot be accurately measured and the user's vision cannot be automatically corrected.

4 is a schematic illustration of a pupil imaging design in which the pupil imaging design is an optical design of a head mounted display in accordance with an embodiment of the present invention.

The non-pupil imaging design and the pupil imaging design can be used as an optical design for the head mounted display 100. Non-pupil imaging designs can be easily established. At the same time, because the non-pupil imaging design has a short path length, a short throw distance between the source image and the virtual reality image can be obtained. The short path length refers to the display of the head mounted display 100 being positioned close to the user's face and the user's eyes. Such an optical design of the head mounted display 100 has the disadvantage of being difficult to modify.

At the same time, the pupil imaging design has a configuration similar to that produced in a periscope of a microscope, binocular or submarine.

Referring to FIG. 4, the pupil imaging design can produce an intermediate image 402 of the source image transmitted from display 400 to a first lens group 401. The resulting intermediate image 402 can be transmitted to the user's eye 404 through a second lens group 403. The user's eye 404 can be positioned at the exit pupil area, which is a virtual reality image.

Advantages of the pupil imaging design include providing a desired path length from the image plane to the user's eyes. In addition, the pupil imaging design provides a longer path length and moves further away from the user's face than a non-pupil imaging design. In addition, optical correction can be enhanced because the pupil imaging design can include more lenses as well as mirrors.

FIG. 5 is a diagram illustrating a detailed configuration of display optics of a head mounted display according to an embodiment of the present invention.

Referring to FIG. 5, the optical device of the head mounted display 100 can include a display 500, an active device 501, a 稜鏡 502, a polarizing beam splitter 503, a lens mirror 504, a lens 506, a first polarizer 507, a second polarizer 508, and A third polarizer 509.

Display 500 can be a flat display or a curved display. The display 500 can be a liquid display such as an LCD or a light emitting diode display such as an OLED.

The active component 501 can be implemented as a microelectromechanical system (MEMS) mirror comprising a plurality of micromirrors. The micromirror includes particles that can be adjusted by rotating toward the X-axis or the Y-axis to modify the optical power and modify the reticle pattern.

The head mounted display 100 can detect the user's vision based on the reticle pattern generated by the varying optical power by controlling the gradient of at least a portion of the micromirrors in the active element 501. Moreover, the user's vision can be corrected by controlling the gradient of at least a portion of the micromirrors in the active element 501 based on the detected vision and by adjusting a focal length of the image provided to the display.

Through the above steps, the head mounted display 100 can more accurately measure and correct the user's vision. In addition, the head mounted display 100 can utilize the precision vision of the micromirror to reduce tolerance tolerance. A method of measuring visual acuity by varying the reticle pattern of the active element 501 will be specifically explained below by referring to FIGS. 7A through 7E.

The active component 501 can be configured perpendicular to the optical path and also perpendicular to the display 500. An explanation about the configuration of the active element 501 will be specifically explained below by referring to FIGS. 6A and 6B.

稜鏡 502 can expand the user's field of view. The polarizing beam splitter 503 can function to separate the incoming rays by penetrating or reflecting the light. A flat or cubic beam splitter can be used.

The lens mirror 504 can be one of a concave lens mirror, a convex lens mirror, and a cylindrical lens mirror. Lens 506 can include one or more of a concave lens, a convex lens, and a cylindrical lens. Lens 506 and lens mirror 504 can be configured as a single structure or can be configured to have a plurality of different lenses.

The first polarizer 507 and the third polarizer 509 may be composed of a quarter wave plate (quarter wave plate), and the second polarizer 508 may be composed of a 1/2 wave plate (a half wave plate). The 1/4 wave plate 507, the 1/4 wave plate 509, and the 1/2 wave plate 508 can generate a plurality of polarization states depending on the state of the incident light ray.

The display 500 can emit light rays, and the first polarizing beam splitter 503 disposed on the front surface of the active element 501 can reflect the light rays emitted by the display 500. The light rays reflected by the first polarizing beam splitter 503 can converge on the lens 506, pass through the 1/4 wave plate and converge on the active element 501.

The active element 501 can reflect the light rays emitted from the lens 506 by converging or diverging. The light rays emitted from the active element 501 can pass through the 1/4 wave plate and converge on the lens 506. Light converges on the lens 506 can pass through the first polarizing beam splitter 503, through the 1/2 wave plate 508, through the second polarizing beam splitter 503, through the quarter wave plate 509 and into the lens mirror 504. Lens mirror 504 can be reflected into the radiation. Light rays reflected from the lens mirror 504 can pass through the quarter-wave plate 509, through the second polarizing beam splitter 503, and as an image on the retina 505 of the user.

In particular, when the display 500 emits X-polarized rays, the X-polarized rays can be reflected from the first polarizing beam splitter and enter the active element 501. In the present embodiment, the X-polar ray may pass through the 1/4 wave plate 507 before entering the active element 501. The light rays reflected from the active element 501 may pass through the quarter wave plate 507 again, and the Y polarized rays may pass through the first polarizing beam splitter 503.

The Y-polarized ray passing through the first polarizing beam splitter 503 can generate a virtual reality image after being incident on the 1/2 wave plate 508, and the Y polarized ray passing through the 1/2 wave plate 508 enters the lens as the X polarized ray. Mirror 504. The incident light ray, which is an X-polarized ray, can pass through the quarter-wave plate 509 (incoming/reflecting) twice (into/reflect), and cause the Y-polarized ray to diverge from the lens mirror 504 on the aperture 505.

In this embodiment, according to an embodiment of the pupil imaging design, the user can see a virtual reality image on the exit pupil.

6A and 6B are schematic views of an active element constituting a head mounted display in accordance with an embodiment of the present invention.

Figure 6A is a diagram for explaining the formation of an image of a MEMS mirror (which is an active element) in accordance with an embodiment of the present invention.

Referring to FIG. 6A, the MEMS mirror 610 can include a plurality of micromirrors 601. The MEMS mirror 610 can be controlled in terms of the position of the micromirror 601. The autonomously dispersed light rays can converge at a point P 600 of the image plane.

6B is a schematic diagram of a plan view of a MEMS mirror 610 (which is an active component) in accordance with an embodiment of the present invention.

Referring to FIG. 6B, the MEMS mirror 610 can be configured in the form of a circular mirror 620 in a circular configuration, and the micromirror 620 can have a function consistent with the function of the mirror. Micromirror 620 has a high degree of reflectivity. Each of the micromirrors 620 may have a fan shape to increase the reflective area, which may enhance optical efficiency. However, the circular configuration and the sector shape are only one of the embodiments for explaining the present invention; the present invention is not limited to the above.

A lens (active element) having a MEMS mirror configuration has the fastest reaction speed because the micro mirror 620 has a very small size and low quality. For example, the reaction speed of the micromirror 620 can exceed 100 KHz. Therefore, the speed of change of the focal length of the micromirror 620 can be implemented to be greater than or equal to 100 KHz.

Additionally, the micromirror 620 can be controlled to modify the focal length of the lens. The MEMS mirror 610 can control translation or rotation about the micromirror 620, respectively, to change the focal length. The rotating micromirror 620 can change the direction of the light ray toward the X axis and the Y axis, and the translation can adjust the phase of the light ray toward the Z axis.

Thus, an embodiment of the present invention can be implemented such that a flat MEMS mirror 610 comprised of a plurality of micromirrors 620 can be vertically disposed relative to the light path of the head mounted display 100 and used to view specific light rays of the force measurement It may be formed near the center of the MEMS mirror 610. Through the above steps, only the main ray for visual force measurement among the light rays emitted from the display can be formed as an image on the user's retina, and the visual acuity can be measured.

Further, the focal length can be varied via rotation and translation of the micromirror 620 to thereby adjust the optical power. The vision can be corrected through the above steps.

7A-7E are schematic diagrams of a method of measuring a user's vision using an active component of a head mounted display in accordance with an embodiment of the present invention.

7A is a schematic illustration of a reticle pattern that varies over the active element according to the user's visual acuity when optics are used to measure vision.

Referring to FIG. 7A, when the display screen 700 emits a light ray, the pixel 701 can be turned on in the display 700, and the turned-on point pixel 701 can enter the lens. When the light ray emitted from the display screen 700 passes through the lens, the size of the pixel 701 which is a spotted light ray can be changed into a flared spot ray by the lens. When the light ray 702 passing through the lens enters the active element, only a specific light ray can be shielded by the rotation and resonance of the micromirror of the active element near the center of the active element. Thus, the particular regional light ray 703 can be formed as an image on the active component among the spotted light rays 702 that pass through the lens. The particular area of light ray 703 formed as an image on the active element may converge to the lens, and other areas of the light ray may not penetrate the lens. Therefore, the light ray passing through the active element can be changed into a dot image 704 of a specific area previously formed on the active element.

According to the Scheiner's principle, which is the principle of visual force measurement, the general visual force measurement method can measure the visual acuity when the light ray is focused on a point 705 in terms of normal vision, and the light ray 706 is Divided by myopia or farsightedness (hyperopia/farsightedness).

In an embodiment of the invention, by applying the Schneider principle and using active components, the head mounted display 100 can be used only by controlling the gradient of at least a portion of the micromirrors and driving other light rays away from the center. Vision-measured light rays can be imaged at the center of the retina to measure vision.

In an embodiment of the invention, the head mounted display 100 can passively perform visual force measurement by using active components. Thus, the head mounted display 100 can be implemented to measure the user's vision by receiving user commands and varying the gradient of the micromirrors that make up the active components.

For example, the head mounted display 100 can be implemented to modify the gradient of the micromirrors that make up the active component by the user via a UI or menu button for visual force measurement. In this embodiment, the UI or menu button for visual force measurement can be implemented in the head mounted display 100 or by an external device (eg, a remote controller).

In particular, the user can modify the gradient of the micromirrors that make up the active element when touching the screen of the head mounted display 100 or manipulating the menu button. The user can store the user's vision at a time when the head-mounted display 100 sees a clear pattern, and the gradient of the micro-mirror that constitutes the active component changes with respect to the user's vision. The head mounted display 100 can be configured to store the detected visual information based on the gradient information of the micromirrors constituting the active component when the visual storage instruction is input by the user, and store the visual information to the user information (eg, use User identifier (ID) and user's biometric information). In this embodiment, the user information may be user information previously stored by the user in the head mounted display 100 or information input by the user together with the vision information.

7B to 7E are schematic views of modifications of the reticle pattern on the active element when measuring normal vision and farsightedness. 7B and 7C are schematic diagrams illustrating a reticle pattern on an active element when normal vision is measured.

Referring to Figures 7B and 7C, the spotted light ray 701 emitted from the display screen 700 as explained in Figure 7A can be expanded after passing through the lens 710. As described above in FIG. 7A, the light rays passing through the lens can be expanded into a point image 702. Light rays 702 diverging from the lens can enter the active element 720.

Light ray 702 entering active element 720 can modify the reticle pattern by translating and rotating the micromirrors that make up active element 720. Therefore, only a specific area of light rays corresponding to the focal length of the user can be formed as an image on the active element 720.

As described in FIG. 7A, the light rays formed on the active element may have a reticle pattern 703 of a specific light ray. In addition, the light rays may become a point image 704 of a particular area previously formed on the active element after passing through the active element. 7B and 7C, a light ray 704 (see FIG. 7A) through the active element 720 can be formed on the center of the user's retina 730, and a light ray 705 for the user's visual force measurement can be generated on the display screen. On the 700, the vision can be measured.

7D and 7E are schematic diagrams illustrating a reticle pattern on an active element when measuring myopia.

Referring to Figures 7D and 7E, the active element 720 can produce a reticle pattern different from normal vision (Figs. 7B and 7C) by rotating and translating the micromirrors of the active element 720 that converge on the light ray 702 on the lens 710. . In the present embodiment, the light ray 704 having the reticle pattern formed and produced on the active element 720 can be formed on the front region of the user's retina 730 in FIGS. 7D and 7E, and can be separated and generated. The light ray 706 is measured by the user. Therefore, myopia can be measured by using the above steps. Furthermore, astigmatism can be measured by adjusting the reticle pattern produced by rotating the azimuth of the reticle pattern produced by the active element 720.

As described above, the head mounted display 100 can control the display screen 700 to generate light rays for visual force measurement, and control the active element 720 to transmit light rays for visual force measurement to the user's retina through the active element 720. Information on the active component 720 is recorded on the 730 and at a point in time when the image is formed on the user's retina 730 as the user's vision information.

In this embodiment, the measured vision information can be stored in the memory of the head mounted display 100. The memory can store the biometric information of the user together. For example, the user's biometric information can store a variety of information such as iris recognition, speech recognition, facial recognition, and fingerprint recognition. Therefore, when the user uses the head mounted display 100 again, the head mounted display 100 can automatically correct the vision based on the user's biometric information to suit the user's vision information.

Specifically, the user can select to perform the recognition through the user's instruction (for example, the UI providing the user identification menu) when the head mounted display 100 recognizes the biometric information of the user, or the user can wear the headset. Identification is automatically performed when the display 100 is worn on its head. When the user is recognized, the head mounted display 100 can correct the vision based on the visual information of the user that matches the biometric information of the user stored in the memory. Since the technique for storing and recognizing the biometric information of the user is applied to the head mounted display 100, an encryption technique for protecting user information can be applied.

In an embodiment of the invention, the method for correcting the user's vision in the head mounted display 100 can correct the user's vision by adjusting the user's optical power using the active components.

Optical power can be expressed as lens power and can be inversely proportional to the focal length. Therefore, the head mounted display 100 can have different focal lengths depending on the user's vision. An active component consisting of multiple micromirrors controls different focal lengths that are presented based on the user's vision. As illustrated in Figure 6A, the active component including the MEMS mirror can modify the direction of the light ray by rotating the micromirror, adjusting the phase of the light ray by translation, and modifying the focal length of the active component. Thus, vision can be corrected.

Moreover, in an embodiment of the invention, the head mounted display 100 can reduce eye fatigue by varying the focus of the virtual reality image. When the head mounted display 100 is used for a long time, the focal length of the virtual reality image can be fixed at one position. In the present embodiment, eye fatigue may occur due to the focus being placed in one position for a long time, and loss of vision may occur.

In order to solve the above problem, the head mounted display 100 can autonomously modify the focus of the virtual reality image at a specified time by controlling the active component. Therefore, the head mounted display 100 can adjust the focus of the virtual reality image by adjusting the optical power of the active device at a specific time. In addition, the head mounted display 100 can modify the focus of the virtual reality image by estimating the position of the object displayed on the display screen and applying image recognition technology. In this embodiment, eye fatigue can be alleviated by matching the focus of the virtual reality image at the location of the environmental object to the active component.

In an embodiment of the invention, when the vision of the myopic user is 3 diopters, the virtual reality object can be formed at a distance of 33 cm. In the present embodiment, the myopic user may feel dizzy when applying a diopter parallax from normal vision (consistent with the object distance of infinity). Incidentally, the diopter is a unit of measurement of the optical power of a lens or a curved mirror, which is equal to the reciprocal of the focal length measured in units of meters (ie, 1/meter). Accordingly, an embodiment of the present invention can apply an optimized value of image distortion by providing an image whose parallax is adjusted to be suitable for the user's vision.

Moreover, in an embodiment of the invention, the head mounted display 100 can correct for high aberrations. Since the entire area of the eye cannot be measured in the corrective lens, only low aberrations can be corrected. However, the active component can be composed of a plurality of MEMS mirrors and the focal lengths (which approximate different lens powers) with respect to the micromirror regions, respectively, can be adjusted. Therefore, correction of high aberration can be performed. Through the above steps, a high aberration detection technique implemented to measure the entire area of the eye (the complete aberration "fingerprint" of the eye) can be applied to detect high aberrations and can be used by using active components. Correct the detected aberrations.

Moreover, in an embodiment of the invention, the head mounted display 100 can extend the range of vision adjustment by establishing an offset value on the lens power of the lens mirror that constitutes the optical device. For example, with respect to a plurality of MEMS mirrors constituting an active element, chromatic aberration increases with diffraction as the optical power increases. Therefore, low light power should be used to drive the head mounted display 100 in order to reduce chromatic aberration. Since the optical power is inversely proportional to the focal length, the optical power can have a lower value when the focal length is larger.

To increase the focal length in the head mounted display 100, an optical power offset can be established on the lens surface, and the offset value of the optical power established in the lens surface can be subtracted from the active component.

For example, when the normal user's vision is 60 diopters and when the optical power of the lens mirror is 27 diopters, the optical power that can be used by the MEMS mirror of the active component can be assumed to be +3 diopters to -3 diopters. When the offset value of the optical power is not established on the lens surface and the normal vision is equivalent, the optical power of the lens mirror may be 27 diopters, and the optical power of the MEMS mirror may be +3 diopters to -3 diopters. In this embodiment, when the near vision is measured, the optical power of the lens surface can be 27 diopters, and the MEMS mirror can correct the visual acuity from 0 diopters to -3 diopters.

Meanwhile, in an embodiment of the present invention, when the offset value of the optical power is established on the lens mirror surface, and the normal vision is equivalently measured, the optical power of the lens mirror surface may be 24 diopters (27 diopters - 3 diopters) And the optical power of the MEMS mirror can be 0 diopter to -6 diopter. Therefore, when the near vision is measured, the visual acuity of up to -6 diopter can be measured and corrected.

The above is merely one of the embodiments for explaining the present invention, and accordingly, embodiments of the present invention can be applied and varied by varying optical power, measurement, and correcting vision by various methods and techniques.

8A and 8B are schematic diagrams of a high definition display implemented using high speed tilting of active elements of a head mounted display, in accordance with an embodiment of the present invention.

The angular resolution of a normal human eye is 1/60 arc minutes. Therefore, the human eye can distinguish 60 pixels/arc. The arc division refers to the angle of one pixel; when the arc score becomes smaller, the resolution becomes higher. The head-mounted display currently used for virtual reality is about 15 pixels/degree. Therefore, when the image is viewed using the head mounted display 100, dots on the pixels can be seen, which can reduce the immersion.

Figure 8A is a schematic illustration of a high speed drive of an active component comprised of a MEMS mirror.

Referring to FIG. 8A, a plurality of micromirrors 802 of the active elements 801 inclined toward the X-axis direction and the Y-axis direction can be driven at a high speed to obtain an effect of about double resolution. As described in FIG. 6B, since the active element having the MEMS mirror includes an extremely light and small micro mirror 620 (low quality), the fastest reaction speed can be obtained. For example, the reaction speed of the micromirror 620 can exceed 100 KHz. Therefore, the speed of change of the focal length of the micromirror 620 can be greater than or equal to 100 KHz.

For example, as illustrated in FIG. 8A, when the micromirror 802 is driven at 120 KHz, the focus of the active element 801 can be shaken at a high speed toward the left side direction and the right side direction (X direction, Y direction) on the focal plane. Therefore, a uniform low-resolution screen on the left and right sides of the display 800 can be combined, and the effect of displaying a high-resolution image can be obtained due to the afterimage effect.

In particular, referring to Figure 8B, one pixel can be 10 microns and the display can include 3x3 pixels. For example, when a 1000x1,000 display (10 micron pixels) is used to achieve a 50 degree field of view, each resolution 810 can be about 1,000/30 pixels/degree, that is, about 33 pixels/degree.

In an embodiment of the present invention, with respect to each pixel of the 3x3 pixel low-resolution display 810 as shown in FIG. 8B, the head mounted display 100 is driven at a high speed by the active component 801 as shown in FIG. 8A, Draw a 5 micron circle (which is half of each pixel). In this embodiment, the display of the head mounted display 100 can be synchronized with the position of each pixel, and a plurality of low resolution images 820 can be scanned, and a plurality of uniform low resolution screens can be combined and displayed with each other. In the present embodiment, the head mounted display 100 can be implemented such that a plurality of combined low resolution screens 820 become high resolution images 830 having resolutions of about 60 pixels/degree, respectively, depending on the afterimage effect.

9A-9C are schematic diagrams of a head mounted display that controls the focus of a virtual reality image by an active component to control visual adjustment/convergence of an eye, in accordance with an embodiment of the present invention.

The head mounted display 100 can modify the focus of the virtual reality image displayed on the display at a specified time.

Referring to Figures 9A-9C, a focus on a layer 904-i of the 3D image can be adjusted by time-division driving the optical power of the MEMS mirror in the active component.

In addition, the head mounted display 100 can estimate the position of the object in the virtual reality image from the virtual reality image displayed on the display screen 900 according to the image recognition method. In the present embodiment, the head mounted display 100 can use the focus of the active component to change the image based on the estimated object position to thereby adjust a focal length of the virtual reality image. In addition, the head mounted display 100 can vary the power of the active component 901 in proportion to the object distance of the user's eye 902 to the virtual reality image to thereby adjust a focus of a layer of the virtual reality image.

For example, FIG. 9A is a schematic diagram of the optical power of the active component 901, wherein the virtual reality is viewed via the head mounted display 100 at a specified distance 904-i (the distance between the placement of the object and the eye 902). In the case of the image, adjust the above optical power. When the object on the specified distance 904-i is viewed, the tilt angle of the micromirrors constituting the active element 901 does not change.

Referring to FIG. 9B, when there is a virtual reality layer 904-n (where the object is placed closer to the eye than the specified distance 904-i), the tilt angle of the MEMS mirror of the active element 901 may be based on the focal length of the object located in the image respectively. And changing, the MEMS mirror adjusts the optical power to + diopter.

Referring to FIG. 9C, when there is a virtual reality layer 904-1 (where the object is placed farther away from the eye than the specified distance 904-i), the tilt angle of the MEMS mirror of the active element 901 may be based on the focal length of the object located in the image respectively. And changing, the MEMS mirror adjusts the optical power to - diopter.

Therefore, when viewing the virtual reality image, the head mounted display 100 can establish a specified value (eg, 1 meter) of the distance from the user's eyes to the object within the virtual reality image as a threshold. In accordance with established standards, head mounted display 100 can use a diopter optical power in a 3D layer (where the object is at a distance of more than 1 meter from the eye) to modify the focal length in a time-sharing manner. In addition, the head mounted display 100 can use a light power of + diopter in the 3D layer (where the object is placed at a distance of more than 1 meter from the eye) to modify the focal length in a time division manner.

In the present embodiment, the 3D layer farther than the critical distance may follow the principle of correcting myopia. Furthermore, a 3D layer that is much farther than the critical distance can result in the effect of seeing a two-dimensional (2D) image 905.

In particular, several 3D layers can be divided into, for example, 16 copies, and a 3D image can be generated, for example, on a 30 Hz basis. In a 10 KHz MEMS device, the MEMS mirror of the active component can then be driven at 30 x 16 = 480 Hz.

10A and 10B are schematic diagrams of a head mounted display that performs visual adjustment/convergence according to the distance of a virtual reality image by an active component, in accordance with an embodiment of the present invention.

As shown in FIGS. 9A-9C, the head mounted display 100 can adjust a focus of a layer of the 3D image by driving the optical power of the MEMS mirror in the active component 901 in a time-sharing manner.

10A and 10B are schematic diagrams of a head mounted display that uses an active component to perform visual adjustment/convergence in accordance with a distance of a virtual reality image, in accordance with an embodiment of the present invention.

Referring to FIG. 10A, the head mounted display 100 can reduce eye fatigue because the two eyes 1000-1 can be adjusted with respect to the object 1002 in the virtual reality image 1001 and the object 1003 having a long placement distance in the object 1003. , visual adjustment of the eye 1000-2 and visual convergence.

The virtual reality image 1001 can include an object 1002 and an object 1003. The head mounted display 100 can use image recognition techniques to estimate the position of objects within the virtual reality image displayed on the display. Therefore, the head mounted display 100 can estimate the object 1002-1 in the articles 1002, 1003 that is placed closer to the eye and the object 1003-1 that is placed longer than the user's eyes.

When there is a virtual reality image layer 1004 (where the object 1002-1 is placed closer to the eye), the tilt angle of the MEMS mirror of the active component 901 may vary depending on the focal length of the object 1002-1 within the image, the MEMS The mirror adjusts the optical power to + diopter as illustrated in Figure 9B. Therefore, eye fatigue can be alleviated because the visual adjustment and visual convergence of the user's eye 1000-1 fits to the object 1002-2 that is placed closer together.

Referring to FIG. 10B, the head mounted display 100 can alleviate eye fatigue because the visual adjustment and visual convergence of the two eyes 1000-1, 1000-2 are suitable for closer distances between objects 1002, 1003 within the virtual reality image. Object 1002.

The virtual reality image 1001 can include an object 1002 and an object 1003. The head mounted display 100 can use image recognition techniques to estimate the position of objects within the virtual reality image displayed on the display. Thus, the head mounted display 100 can estimate an object 1002-1 that is closer to the eye of the articles 1002, 1003 and an object 1003-1 that is a longer distance from the user's eyes.

When there is a virtual reality image layer 1005 (where the object 1003-1 is placed at a longer distance from the eye), the tilt angle of the MEMS mirror of the active component 901 may vary according to the focal length of the object 1003-1 within the image, the MEMS The mirror adjusts the optical power to - diopter (as shown in Figure 9C). In addition, eye fatigue can be alleviated because the visual adjustment of the user's eyes 1000-1, 1000-2, and visual convergence are suitable for objects 1003-2 that are placed at a longer distance.

Through the above method, the head mounted display 100 can minimize eye fatigue by changing the focus of the user after a specified time has elapsed. Therefore, when the focal length between the user's eyes and the image of the head mounted display 100 is a long distance, and when the user views the image for more than a specified time, the head mounted display 100 can move the user's focus to An object in the object that has a close focal length in the image. Meanwhile, when the focal length between the user's eyes and the image of the head mounted display 100 is a relatively close distance, and when the user views the image for more than a specified time, the head mounted display 100 can move the focus of the user to An object with a long focal length in an object within the image.

11 is a block diagram showing a configuration of a head mounted display for augmenting a real-world image using an active element and a diffractive element, in accordance with an embodiment of the present invention.

Augmented reality is a technique used to combine virtual reality images with real-world physical environment dimensions. The problem of inconsistencies in the focus between virtual reality images and real-world images may occur.

Referring to Figure 11, X-polarized light rays emitted from display screen 1100 can pass through lens 1106, penetrate first diffractive element 1103, pass through quarter-wave plate 1107, and converge on active element 1101. In this embodiment, the lens 1106 can be implemented as a collimating lens to produce X-polarized light rays as parallel light rays.

The first diffractive element 1103 can be disposed on an interior region of the light guide 1105 and parallel to the active component 1101. Furthermore, the first diffractive element 1103 can pass X-polarized light rays, which are first linearly polarized light rays emitted from the display 1100, and Y-polarized light rays (which are relative to the first linearly polarized light rays) A vertical second linearly polarized light ray produces a diffraction.

The active component 1101 can adjust the gradient by rotating and translating the micromirrors. The user's vision can be measured using a modifiable mask pattern of the active element 1101. In addition, the active component 1101 can correct the user's vision by adjusting the optical power.

The active element 1101 can modify the angle of the light ray 1108 by diverging the Y-polarized light ray using the quarter-wave plate 1107 and total reflection on the first diffractive element 1103. In the present embodiment, the first diffractive element 1103 and the second diffractive element 1104 may be disposed on an inner region of the light guide 1105, and the light guide may be a waveguide (which is a flat glass). The light ray 1108, which is diffracted by the first diffractive element 1103, is totally reflective within the light guide 1105 and is diffracted on the second diffractive element 1104. The light ray 1108 diffracted on the second diffractive element 1104 can be formed as an image on the user's retina 1102.

In the present embodiment, the optical axis of the active element 1101 can be placed in a range from 0 degrees to +/- 15 degrees with respect to the optical axis of the eye on the exit pupil axis, the Z axis. Therefore, the head mounted display 100 can be established in the form of thin glasses to improve the focus inconsistency between the virtual reality image and the real image, by placing the active component on the side surface to prevent The front field of view of the eye 1102 is impeded.

The above X-polarized light ray and Y-polarized light ray are only one of the embodiments for explaining the present invention; the present invention is not limited to the above, and various other modifications can be implemented.

12 is a flow chart of a method of measuring and correcting a user's vision using an active component of a head mounted display, in accordance with an embodiment of the present invention.

In step S1200, the head mounted display 100 can detect the user's vision by using an active component composed of a plurality of micromirrors. Methods for detecting vision have been specifically explained above and will not be further described below.

Step S1210 is performed, and the head mounted display 100 can store the detected visual information of the user and the biometric information of the user. For example, the biometric information of the user may include various information such as iris recognition, speech recognition, face recognition, and fingerprint recognition. Therefore, when the user re-uses the head mounted display 100, the head mounted display 100 can automatically correct the vision based on the user's biometric information to suit the user's vision information.

Step S1220, when the user is identified based on the stored user information, the head mounted display 100 can control a gradient of at least a portion of the plurality of micromirrors based on the detected vision information, thereby providing the adjustment to The focal length of the image of the display. The method for adjusting the focal length has been described above and will not be further described below.

As described above, in an embodiment of the invention, the head mounted display can measure and correct the user's vision using the active components to thereby provide the user with an optimized image. In addition, the head mounted display can be miniaturized by using active components and provides a user with a high definition display screen.

Further, in addition to the storage body (not shown), the program for executing the control method described above may be stored in various recording media, and it is provided with a display device.

For example, a non-transitory computer readable medium storing the program can be provided that executes the method via a processor (not shown) of the display device.

In particular, the above various applications or programs can be stored and provided in a non-transitory computer readable recording medium such as a compact disc (CD), a digital versatile disc (DVD), a hard disc, a blue light. A disc, a USB, a memory card or a ROM, but the invention is not limited thereto.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ head mounted display
101‧‧‧ Controller
210‧‧‧ display
220‧‧‧ processor
230‧‧‧ memory
240‧‧‧Active components
260‧‧‧ optical sectioning
270‧‧‧ display screen
275‧‧‧beam splitter
280‧‧‧ lens
285‧‧‧ lens mirror
290‧‧‧ polarizer
295‧‧‧稜鏡
300‧‧‧ display screen
301‧‧‧ lens mirror
302‧‧‧User's eyes
400‧‧‧ display
401‧‧‧First lens group
402‧‧‧Intermediate imagery
403‧‧‧second lens group
404‧‧‧ eyes
500‧‧‧ display
501‧‧‧Active components
502‧‧‧稜鏡
503‧‧‧Polarized beam splitter
504‧‧‧ lens mirror
505‧‧‧ User's retina
506‧‧‧ lens
507‧‧‧First polarizer/1/4 wave plate
508‧‧‧Second polarizer/1/2 wave plate
509‧‧‧third polarizer/1/4 wave plate
600‧‧ ‧ point P
601‧‧‧Micromirror
610‧‧‧Microelectromechanical systems (MEMS) mirrors
620‧‧‧Micromirror
700‧‧‧ display screen
701‧‧‧pixel/dot light rays
702‧‧‧ spot light ray/dot image
703‧‧‧Specific area light ray/mask pattern
704‧‧‧ Point image / light ray
705‧‧ points/light rays
706‧‧‧Light rays
710‧‧ lens
720‧‧‧Active components
730‧‧‧ User's retina
800‧‧‧ display
801‧‧‧Active components
802‧‧‧micromirror
810‧‧‧Low-resolution display
820‧‧‧Low-resolution image/low resolution screen
830‧‧‧High resolution image
900‧‧‧display screen
901‧‧‧Active components
902‧‧‧User's eyes
904-1‧‧‧Virtual Reality Layer
904-i‧‧‧layer/designated distance
904-n‧‧‧Virtual Reality Layer
905‧‧‧2D image
1000-1‧‧‧ eyes
1000-2‧‧‧ eyes
1001‧‧‧virtual reality imagery
1002‧‧‧ objects
1002-1‧‧‧ objects
1002-2‧‧‧ objects
1003‧‧‧ objects
1003-1‧‧‧ objects
1003-2‧‧‧ objects
1004‧‧‧Virtual Reality Image Layer
1005‧‧‧Virtual Reality Image Layer
1100‧‧‧display screen
1101‧‧‧Active components
1102‧‧‧ User's retina
1103‧‧‧First diffractive element
1104‧‧‧second diffractive element
1105‧‧‧Light Guide
1106‧‧‧ lens
1107‧‧‧1/4 wave plate
1108‧‧‧Light rays
S1200‧‧‧Steps
S1210‧‧‧Steps
S1220‧‧‧Steps

The above and other aspects, features and advantages of some embodiments of the present invention will be described in conjunction with the accompanying drawings in which: FIG. Schematic diagram of the general configuration of head mounted display, HMD). 2A is a block diagram of a configuration of a head mounted display in accordance with an embodiment of the present invention. 2B is a block diagram of a configuration of an optical slice in a head mounted display in accordance with an embodiment of the present invention. 3 is a schematic diagram of a conventional head mounted display that corrects the user's vision. 4 is a schematic illustration of a pupil imaging design in which the pupil imaging design is an optical design of a head mounted display in accordance with an embodiment of the present invention. FIG. 5 is a diagram illustrating a detailed configuration of display optics of a head mounted display according to an embodiment of the present invention. 6A and 6B are schematic views of an active element constituting a head mounted display in accordance with an embodiment of the present invention. 7A-7E are schematic diagrams of a method of measuring a user's vision using an active component of a head mounted display in accordance with an embodiment of the present invention. 8A and 8B are schematic diagrams of a high definition display implemented using high speed tilting of active elements of a head mounted display, in accordance with an embodiment of the present invention. 9A-9C are schematic diagrams of a head mounted display that controls the focus of a virtual reality image by an active component to control visual adjustment/convergence of an eye, in accordance with an embodiment of the present invention. 10A and 10B are schematic diagrams of a head mounted display that performs visual adjustment/convergence according to the distance of a virtual reality image by an active component, in accordance with an embodiment of the present invention. 11 is a block diagram showing a configuration of a head mounted display for augmenting a real-world image using an active element and a diffractive element, in accordance with an embodiment of the present invention. 12 is a flow chart of a method of measuring and correcting a user's vision using an active component of a head mounted display, in accordance with an embodiment of the present invention. In all the figures, like reference numerals are used to refer to the like parts, components, and structures.

500‧‧‧ display

501‧‧‧Active components

502‧‧‧稜鏡

503‧‧‧Polarized beam splitter

504‧‧‧ lens mirror

505‧‧‧ User's retina

506‧‧‧ lens

507‧‧‧First polarizer/1/4 wave plate

508‧‧‧Second polarizer/1/2 wave plate

509‧‧‧third polarizer/1/4 wave plate

Claims (15)

A head mounted display device, the device comprising: a display for providing an image; an active component comprising a plurality of micromirrors for reflecting the image provided on the display; and a processor For performing the following operations: detecting a user's vision, and controlling a gradient of at least a portion of the plurality of micromirrors based on the detected visual force of the user to adjust for being provided on the display a focal length of the image. The head-mounted display device of claim 1, wherein the processor is further configured to: generate a mask pattern on the active component to enable transmission from the display Only a specific area of a light ray that is measured by force is formed as an image on a retina of the user, and the visual power of the user is detected by varying an optical power of the active element. The head-mounted display device of claim 1, wherein the processor is further configured to adjust an optical power of the active component based on the detected visual force of the user to correct the The user's vision. The head-mounted display device of claim 1, wherein the processor is further configured to: change a focus of a virtual reality image displayed on the display at a specified time, or An object location of the virtual reality image displayed on the display is estimated using image recognition to vary a focal length of the virtual reality image. The head-mounted display device of claim 1, wherein the processor is further configured to: perform an operation by: causing an optical power of the active component to follow an object of the virtual reality image a proportional change to adjust a focus of each layer of the virtual reality image, and when the user is nearsighted, by specifying an offset of an optical power of a lens to cause The optical power of the active component changes to extend a range of vision adjustments of the user. The head mounted display device of claim 1, wherein the processor is configured to drive the active device at a high speed to expand the resolution of the display. The head mounted display device of claim 1, wherein the active component is disposed in a vertical direction with respect to the display and a light path. The head-mounted display device of claim 1, further comprising: a memory for storing the detected visual information of the user and a biometric information of the user. The head-mounted display device of claim 1, further comprising: a plurality of polarizers, wherein the head-mounted display device obtains a virtual reality image by: a first polarizer Provided between the active component and a lens; a second polarizer disposed between a lens mirror and a front surface of a second polarizing beam splitter; and a third polarizer perpendicular to The second polarizer is disposed parallel to the active component and disposed on a side surface of the second polarizing beam splitter. The head-mounted display device of claim 9, wherein the first polarizer and the second polarizer each comprise a quarter-wave plate, and the third polarizer comprises one or two One wave plate. The head-mounted display device of claim 1, further comprising: a collimating lens for generating a light ray emitted from the display to become a parallel ray; the active component for converging Or diverging the light ray emitted from the lens; a first diffractive element for diffracting the light ray emitted from the active element; a quarter-wave plate disposed at the Between a diffractive element and the active element to change a polarized state of the light ray; a light guide for guiding the diffracted light ray using a total reflection; and a second diffractive element And using the diffraction to emit the light rays to the user. The head mounted display device of claim 11, wherein the first diffractive element is further configured to: pass a first linear polarized light ray emitted from the display, and A second linearly polarized light ray perpendicular to the first linearly polarized light ray produces a diffraction. The head mounted display device of claim 11, wherein the device adjusts a focus of an augmented reality image by: positioning the first diffractive element parallel to the An active element; the second diffractive element is disposed parallel to the eye of the user; and an optical axis of the active element is disposed at a specified angle relative to an optical axis of the user's eye. A display method of a head mounted display device, the method comprising: detecting a user's vision information by using an active component including a plurality of micromirrors; storing the detected visual information of the user to And the information of the user; and when the user is identified by the information of the user, controlling one of the plurality of micromirrors based on the detected visual information of the user Gradient to adjust a focal length of an image provided to a display. The display method of the head mounted display device of claim 14, wherein the detecting the visual force of the user comprises: generating a reticle pattern to cause only one light ray emitted from the display a specific area is formed on a center of the active element for a visual force measurement of the user, and a plurality of areas are formed as an image on a retina of the user; The optical power of the active component is measured to measure the vision.